2.4.2、访问与修改 var testGetArrValue=arrayObj[1]; arrayObj[1]= "值"; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //4.2、访问与修改array12[8]="hello array12";//赋值或修改console.log(array12[8]);//取值//遍历for(vari=0;i<array13.length;i++)...
JavaScript Array filter() Thefilter()method creates a new array with array elements that pass a test. This example creates a new array from elements with a value larger than 18: Example constnumbers = [45,4,9,16,25]; constover18 = numbers.filter(myFunction); ...
functiontest(o){vari=0;// i 在整个函数体内均是有定义的if(typeofo=="object"){varj=0;// j 在函数体内是有定义的,不仅仅是在这个代码段内for(vark=0;k<10;k++){// k 在函数体内是有定义的,不仅仅是在循环内console.log(k);// 输出数字 0~9}console.log(k);// k 已经定义了,输出 10}c...
Array.prototype.noRepeat =function(){varresult =[];for(vari = 0; i <this.length; i++){if(result.indexOf(this[i]) == -1){ result.push(this[i]); } }returnresult; } Array.prototype.inArray=function(value){for(vari = 0; i <this.length; i++){if(this[i] ===value){returnt...
Find Element in Array Write a JavaScript function to find an array containing a specific element. Test data: arr = [2, 5, 9, 6]; console.log(contains(arr, 5)); [True] Visual Presentation: Sample Solution: JavaScript Code: // Function to check if an array contains a specific elementfu...
Write a JavaScript function to find an array containing a specific element. Test data : arr = [2, 5, 9, 6]; console.log(contains(arr, 5)); [True] Click me to see the solution 33. Empty Array Write a JavaScript script to empty an array while keeping the original. ...
every 对数组中每一项运行给定函数,如果函数对每一项都返回true,则返回true every(fn(value,index,array){return ...},[this]) 2.some 对数组中每一项运行给定函数,如果函数对任一项都返回true,则返回true 3.filter 对数组中每一项运行给定函数,返回该函数会返回true的项组成的数组 4.forEach 对数组每一项...
The first line of the input isTdenoting the number of test cases. ThenTtest cases follow. Each test case contains two lines. The first line of each test case is a numberNdenoting the size of the array and in the next line areNspace-separated values ofA[]. ...
$ npm install mocha $ mkdir test $ $EDITOR test/test.js # or open with your favorite editor 在编辑器中输入: var assert = require('assert'); describe('Array', function() { describe('#indexOf()', function() { it('should return -1 when the value is not present', function() { ...
The find() method returns the value of the first array element that passes a test function.This example finds (returns the value of ) the first element that is larger than 18:Example const numbers = [4, 9, 16, 25, 29];let first = numbers.find(myFunction);function myFunction(value, ...